Again: Foreflight uses both .gov and FAA plates and charts (and updates them automatically, so you know you have the latest pubs). Both types of chart are legal for CONUS military use, and you don't need to go through military chart distribution channels, which can take months, assuming you can even get in touch with someone.
Believe me, I've been down this road before (before iPads were in the cockpit), and it led NOWHERE. The AT&T message is spot on when it comes to trying to contact the approach plate/chart distro folks. Our squadron still gets Africa charts from deployment 2+ years ago, and evidently nobody in the entire DOD has the authority to stop distro of unneeded pubs. It's a huge waste of paper and shipping resources every 4-8 weeks.
I'd suggest to your DH that someone might have Foreflight and be willing to lend a device for the weekend, or be part of the airshow crew. Squadrons can get also WingX Pro subscriptions for free, our squadron uses it on several unit-owned iPads. It's a little less intuitive than Foreflight, but no less capable. We used to use Foreflight, until they stopped providing it free of charge to military. I maintain a personal FF subscription, because it is worth it.